feat: Support for Security Hub

[kaykhan]

Description

Adding support for parsing of security hub messages into a readable slack message.

{
  "detail-type": ["Security Hub Findings - Imported"],
  "source": ["aws.securityhub"]
}

Examples:

Motivation and Context

#207
#221

Breaking Changes

None

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• I have executed pre-commit run -a on my pull request

[github-actions]

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with no activity. Remove stale label or comment or this PR will be closed in 10 days

[kaykhan]

This is ready for a review

[bryantbiggs]

CI failed check needs to be remediated

[kaykhan]

CI failed check needs to be remediated

Fixed the majority of them - some of the linting issue i believe are not a result of my changes. Especially

/notify_slack.py:506:1: C901 'get_slack_message_payload' is too complex (11)